Pump



April 5, 1960 e. s. DLLJGOS PUMP Filed April 15, 1957 United States Patent PUMP Gerald S. Dlugos, Parma, Ohio, assignor to Borg-Warner Corporation, Chicago, III., a corporation of Illinois Application April 15, 1957, Serial No. 652,736

3 Claims. (Cl. 103-4) with a common pressure loading bushing or end plate means and which is especially adapted for use as a lubricating pump assembly. Such an assembly is so constructed to be extremely compact, and is further provided with a particular housing forming a sump from which one of the pumping elements obtains its supply of fluid.

Therefore, the principal object of this invention is the provision of an improved, compact lubricating pump assembly.

Another object of this invention is the provision of an improved, compact lubricating pump assembly of the pressure loaded variety wherein the plurality of pumping means therein is so constructed and arranged to utilize a common pressure loaded bushing or end plate means, and wherein the assembly housing is so constructed to provide a sump for one of the pumping means of the assembly.

These and other objects and features of this invention will become apparent from the following description when taken with the accompanying drawing in which:

Figure 1 is a view taken of line 1-1 of Figure 2 and looking in the direction of the arrows; and

Figure 2 is a section view taken on line 2-2 of Figure 1 looking in the direction of the arrows.

Referring now to the drawing, and in particular to Figure 2, the pump assembly, generally indicated by P, comprises a housing H including a body and a cover 11, suitably secured together by bolt means or the like, indicated at 12.

T he body 10 is of a generally cup-shape and terminates in an outwardly directed continuous flanged portion 13 having suitable bored openings 14 therethrough to receive bolt means by which the assembly P is retained in its proper operating position, and the body further comprises a substantially centrally disposed upstanding. substantially cylindrical portion 15. The upstanding portion 15 is bored to provide overlapping or intersecting, parallel, cylindrical cavities 16 and 17 to receive, in spaced relation, pairs of gears 18 and 19, and 20 and 21, and 22 and 23, each pair meshing in the overlapping area of the cavities. The pairs of gears may be of different widths, thereby providing different capacities, or may be of the same width, thereby providing equal capacities, Without departing from the spirit of this invention.

The body 19 is also provided with cavities 24 and 25 of a smaller diameter but intersecting and communicating with the cavities 16 and 17, respectively, and the cover 11 is provided with stepped bores 26 and 27, each portion of which is smaller in diameter but intersecting and communicating with the cavities l6 and 17, respectively, when the body and cover are assembled.

The cavities 24 and 25 receive cylindrical bearing means 23 and 29 in which are journaled one of the terminal ends of shafts 30 and 31, respectively. The opposite terminal end of the shaft 30 is journaled in a journal portion of an axially movable bushing or end plate means 32 disposed within the cavity 16 and having one face in contact with the adjacent side face of the gear 22, the journal portion being slidably received in the bore 26 and beingof a complementary shape relative thereto. The shaft 31 is provided with a splined portion 33 disposed outside the housing H to receive a driving conmotion from a source of power (not shown), and has an intermediate portion journaled in a journal portion of an axially movable bushing or end plate means34 disposed within the cavity 17 and having one face in contact with the adjacent side face of the gear 23, the journal portion being slidably' received in the bore' 27 and being of a complementary shape relative thereto.

The gears 18 and 19 are, as illustrated, made integral with the shafts 30 and 31, respectively, but could be suitably afi'ixed thereto in other ways without departing from the spirit of this invention. The gear 20 is drivingly connected with the shaft 30 by means of a pin 35 passing through a hole 36 formed in the shaft 30 and having its terminal ends disposed within a slot formed through the hub portion of'the gear 28, the gear thereby being capable of axial movement relative to the shaftwhile. retaining its driving connection therewith. The gear 21 is disposed on the shaft 31 and is capable of axialmovement with regard thereto. It is thus obvious that the pumping means comprised by the gears 20 and 21 derives its drive from the gear 20 and the shaft 30.

The gear 22 is disposed on the shaft 30 and is capable of axial movement with regard thereto. The gear 23 is drivingly connected to the shaft 31 by means of a pin 37 passing through a hole 38 formed in the shaft 31 and having its terminal ends disposed within a slot formed through the hub portion of the gear 23, the gear thereby being capable of axial movement relative to the shaft while retaining its driving connection therewith.

The pumping elements are separated by means of spaced bearing spacer means40, 41, 42 and 43; the means 40 being disposed between the-gears 18 and 20-and in contact with the adjacent side faces thereof, the means 41 being disposed between the gears 19 and 21 and in contact with the adjacent side faces thereof; the means 42 being disposed between the gears 20 and 22 and in contact with the adjacent side faces thereof; and, the means 43 being disposed between the gears 21 and 24 and in contact with the adjacent side faces thereof. These bearing spacer means are constructed to be axially movable within the respective housing cavities and are provided with substantially centrally positioned bores for rotatable reception of the shafts 30 and 31.

As is obvious, the bearing spacer means, together with the axially movable bushing or end plate means, sepame the housing cavities into a plurality of pumping chambers each of which is provided with a pumping means comprising a pair of intermeshing gears. It should be noted at this time that the gears 18 and 19 are in contact with the terminal walls of the bores 16 and' 17, re-

speetively, which walls provide end plate means for the pump means 18 and 19.

Each of the bearing spacer means and the axially r'novable bushing or end plates means may be provided with relief recesses similar to those shown and described in Lauck et al. Patent No. 2,420,622, and for the same purpose. Note also that the shafts 30 and 31 are hollow for the passage of leakage fluid therethrough.

' Each of the pumping chambers, generally identified as PC-l, PC-2 and PC-3, is provided with an inlet and an outlet for the flow of fluid to and from the chambers. Thus, the chamber PC-l is provided with aninlet-"M (see Figure 1) opening into the cup-shaped housing which forms sump for this pump, and isi provided with' an outlet 45 terminating in the flange 13 of the housing H.

Theclia'mber PC-2 is provided with an inlet "46 and an outlet 47 both of which terminate in the flange 13 of the The eharnber PC3 is providedwith anin- :le 8 and-anjoutletj 549 both of which terminate ,inthe eil 3 of therhousing H." 7 i j V proper connections for the inlets 46 and 48 and pen operatingpo's'ition:to its utilization device.

"e axially movable bushing orend plate means 32, provided with pressure motive surfacesyspaced rpm hegea rsf22 and 23, respectively, whichdefine-with illsof the housing H annular, intersecting, preseufi'otive chambers 50 and 51, ,7 respectively, which are adapted to receive fluid under-"pressure to 6t againstthe niotiv'ej surfaces 'and urge'the bushing or dinatejmeafis, together with thefgears 22, 23, 20, 21 dfthe 'bearing spaeerf'fmea'nsij42, 43, 40,41 downwardly,

*asjv't vied in, the drawing. "Such urging 'will pro'vide ;;pnmping s'eals between the adjacent "gear side faces and b nandfwill prevent orsubstantially reduce the leakage defface's, ther'eby'improving the efficiency of the ly'and'each of its'p'umping means. v

Fluidi'f or the purpose ,of' providing the motive force am'st'ithebushingor end plate means 32 'and34 'is de- 'Ihe* passage'YSZ'Ymayj he. formed in the manner and described in the aforementioned'Lauck'et al nt'. "Since the pressure is derived from output preswillbe obviousthat as the pressure output inteases, .th'e force, known asa pressure loading force, "will increase.

, To provide an initial loading force'for the pump aseived in open-ended cavities in'fthe cover 11, which ain'st the bushing or end plate means 32 and 34, "respee'tively. c s v v 7 Thus 'therehasbeen'describeda compact pumpca'ssem- :blyihaying a-pliirality offlpumpg'ea ch of Whichisof the "pressure loaded variety, yet' employ common pressure i ed bushing or end plate means, and whereinthe re'sisure so'u rce to aceorri'plish'the loadingis derived from one pf' theipuinps. v Further, the pump assemblyfjis housed e hoiisingis flanged "and employs the'fian'gel for the terwhefreby when iconnected in its .operating environnt, proper cbnne'ctio'n with the inlets and" 6utlets""will be made.

,. wane thisfinvention has heennescribed with areas-Ce "to afieembadiihem, it'is to'be understood'lthat 'this'is'by waylofnillustration'and notby way..of' limitatiomand :"the. appended; claims should be'construe'd'asbroadly as ifie pribt an will p eriiiit. V

211mm: c i ".In a'purnp assembly, the combination of 'ajhousing "it ng'sub'stantia'lly cupped-shaped walls terminating in' ets are made when the. device is attached in its ithe'feridplate, bushing or bearing means, as the'cas'e may under pressure from outlet to inlet across the V ediromthe outlet of the pump comprising the gears 2 nd 2'3faud ,is provided'by a communication or pas 1 sag SZQbetWeeIi the chambers 50,51 and the'chamber y, 'tl'iere arefprovidedcompression springs 53 andv jhousingwhich forms a sump'for one pr the-pumps.

xiiinalf'ends'iforat least some of the pump inlets and out- 7 ing means including axially movable bearing. spacer means disposed between adjacent pumping elements and axially movable bushing means disposed between one of said wall means and the pumping elements adjacent 6 thereto, and means to pressure load said bushing means to axially move said bushing means, said pumping elements, said spacer means in packed relation against the other of said wall means to thereby provide pumping seals between said chamber defining rneans and the adjacent side faces'of said pumping elements."

2. he pump assembly, the combination of a housing having'substantially cupped-shaped walls terminating in an outwardly directed flange and a substantially centrallyidis'posed upstanding portion removed from said '15 walls, said upstanding portion having a pair of spaced wall means, means 'definin'g'a cavity in said upstanding portion between said wall means, said walls and upstanding portion defining a sump means therebetween, meansdefining a plurality of pumping chambersin said fav ity, fs'a'id pumping chambers being in substantially ligned' relation'between' said wallrrneans, an inlet and an outlet in each pumping'chamb'en'one of said inlets nicating'with said 'surnp means, the remainder of ,1 lets 'and said outlets terminating in said flange, '25 pumping elements in eachf pumping chamber, said. definling rn'eans'f'including :a'xia'lly movable bearing spacer "means disposed between adjacent pumping elements and axially movable bushing means disposed between one 'of saidwall means and j the pumping elements adjacent ethe're'to, and means to pressure load said bushing means 9 axiallyi'move said bushingimeans, said pumping elemerit's,and'said spacer 'means in packed relation against theother of saidwall means tothereby provide pump- QingTseaIsQbetvVeen' said chamber defining means and the 7:1 .1 ,entside faces of said pumping elements, said means .Ttof'prefssureload said bushing means comprising means c orrimunijcfating fiuidout put' pressure or one of said pump- "iiigchairibers to said bushing means.

l3min'aipump assemblmYhe combination of a housing "havingsubstantially cupped-shaped walls terminating in ,,an,outwardly directed flange and a substantially cenft'r'ally -dispersed upstanding portion, said walls and said 1 tanding'fportionldefininga sumpmeans therebetween, ,sa1dupstandingjportion havingahpair of spaced wall "nieansfmeans'definingflacavity in said upstanding poretioubetweerisaidwalljineans, means defining a plurality 'efpmnpifi chamberstin said'cavity, said'pumping chamabers being in. substantially "aligned relation between said wall-meansgan "inlet and an ,outlet foreach pumping 501;ehamher,"one voflfsaidf'inlets"communicating with said means and, the irema'inder of said inlets and all of said 'outl e'ts terir'iinatingin 's'aid flange, pairs of pumping elements in each pumping chamber, a shaft means, ineansjldrivingly'iconnecting at least one of each pair of 5 lpu rripin gjelements with said shaft means, at least .one of saidnrtvta'gly connected pumping elements being con- ,nectedffo r axial movement relative to said shaft means, said defining means including axially movable bearing 7 spacer in 511s disposed betweenladjacent pumping elegenius and axiallymovablefbushing means disposed beofisaidjw'all' means and the. pumping elements anaesthesia, means defining a pressure'motive chamberfi nicludin gta portion ofhsaid axially movable bushing m"'ia ,iaaj Qmeansto communicate high pressure fluid {t said at?) 'tsc amb'er to urge said bushing means and {laid spacer means tandisaid pumping elements 'in packed 'relationfagainst' the other ofsaid wall means toprovide v :p re ssureseals between said chamber'defining means and the i adjacent side races of said pumping elements.

kefereneesj Cited in the file of this patent UNITEDSTATES PATENTS 275,844 'Ne'ff et a1. Apr. 17, 1883 V V (other references on following page) 5 UNITED STATES PATENTS Kirkham Dec. 28, 1920 Volh-nann May 3, 1927 Ross Sept. 27, 1932 Kleckner July 23, 1935 Hassler Jan. 2, 1940 Loveday Feb. 16, 1943 Etnyre Aug. 14, 1945 6 Damn Apr. 23, 1946 Lauck Dec. 17, 1946 Wunsch et a1. Apr. 6, 1948 Clarke Dec. 6, 1949 Thomas Oct. 24, 1950 Lauck Jan. 12, 1954 Lauck Jan. 12, 1954 Lapsley Aug. 5, 1958 

